A heart-shaped diamond necklace. Photo Christie's Image Ltd 2014

Set with a heart-shaped diamond, weighing approximately 11.53 carats, to the fine link chain with spectacle-set brilliant-cut diamonds, mounted in platinum, 45.0 cm. Estimate CHF900,000 – CHF1,350,000 ($1,030,743 - $1,546,115)

Accompanied by report no. 2155844479 dated 30 December 2013 from the GIA Gemological Institute of America stating that the diamond is D colour, Internally Flawless clarity

Christie's. GENEVA MAGNIFICENT JEWELS. 14 May 2014, Geneva -http://www.christies.com/